First I saw the post on Reddit about Iran asking to be paid in Yen
Then I see even a Black Hat SEO guy is looking to diversify.
Then I remember some old posts about some other Middle Eastern countries dropping the dollar as their primary currency peg (Kuwait and Syria).
As far as commodities blowing out the US stock market, this is old news though. Check out those graphs.
When will the US public notice?
When they notice and start diversifying, it will probably be time to get back into the dollar.